Change Apache with Nginx ?

Hy there, like everyone says nginx is more faster then apache with i dont know because i never used nginx.

What i whant to do is change apache to nginx the problem is with i dont know it how to do it maybe if o look on google i fiind the solution but the problem is on my dedicated server i got like 50 cpanel accounts ( cusstomers ) and i didn make nothink because i whant to be sure nothink bad happens with my cusstomers website.

Is it safe ?
Where can i fiind a right tutorial ?

Tnx guys

 

For nginx plugins for cpanel i have to pay like 10$ / mo for what ? The only think is to see a tutorial or sompting to replace apache with nginx and to know if it will affect the old accounts witch was working on apache.